Machine for wrapping bodies



A. MONK'HOUSE MACH INE FOR WRAPPING BODIES v Filed Nov. 28. 1925 2 heets-Sheet 1 INVENTOR WITNESSES:

' ATTORNEY Oct. 11 1927.

3 A. MONKHOUSE MACHINE FOR WRAPPING BODIES Filed Nov. 28. 1925 2 h h 2 YI M WITNESSES: I INVENTOR Patented Oct. ll, 1927.

UNITED STATES PATENT OFFICE.

ALLAN MONKHOUSE, OF ROSELEIGH, ENGLAND, ASSIGNOR TC VIESTINGEOUSE ELEC- TRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

MACHINE FOR VJRAPPTNG BODIES.-

Application filed November 28, 1923, Serial No. 677,587, and in Great Britain December 2, 1922.

This invention relates to machines for Wrapping bodies such as bars, rods, bolts, studs, mandrels, or the like, hereinafter referred to as mandrels, with paper, fabric, or other flexible material, the wrap being either left permanently attached to the mandrel or removed therefrom so that a tube is obtained.

Such machines are commonly employed in the manufacture of insulating tubes and for applying an insulating wrap to studs, bolts, and the like intended for use in connection with electrical apparatus. \Vith machines of this nature, paper or other flexible material which has previously been treated with an adhesive isv wrapped or wound under tension on a mandrel maintained in intimate contact with one or more smoothing devices such as rollers or fixed plates or irons. lVhen rollers are used as smoothing devices they are in some cases positively rotated and drive the mandrel by frictional contact with the material which is being wound thereon but in the majority of cases irrespective of whether he smoothing devices are in the form of rollers or irons the mandrel is positively rotated, which ne cessitates its ends being mounted in bearings and, when it is relatively long com parison with its diameter, the provision of means for maintaining a substantially even pressure over the entire width of the wrapping material and preventing deflection of the mandrel between its ends.

The object of the present invention is to provide improved means for maintaining a uniform distribution of pressure over the entire width of the wrapping material which will at the same time enable the mandrel to be positively driven without involving the necessity of mounting the ends of the same in bearings or the provision of means to prevent deflection of the same between its ends. To the attainment of this object, the invention consists in making the mandrel and at least one of the smoothing devices of magnetizable material and in providing means for magnetizing the one or the other of said magnetizable parts whereby the force of magnetic attraction between the smoothing device or devices and the mandrel effects a substantially uniform pressure over the entire effective width of the latter.

In the accompanying drawing, Fig. l is a diagrammatic view, partially in side elevation and partially in section of amachine constructed in accordance with the invention, and Fig. 2 is a fragmentary view in front elevation of the machine of Fig. 1.

The machine comprises a supporting frame 1 of ordinary construction, provided with bearings having a roll 2 of paper or other flexible material 3, and a surface or table 4;, over which the paper is drawn to be wrapped round a rotary mandrel 5. In the particular arrangement shown, the rotary mandrel consists of an iron bolt the head 6 of which is clamped in a suitable chuck 7 connected through a flexible driving connection 8 to a driving shaft so that the bolt can be continuously rotated on its axis and thereby wrapped with the flexible material 3. Mounted on the frame 1 are plates 9,10 of magnetizable material between which is located the core 11 and magnetizing coil 12 of an electromagnet. The upper part of the plate 9 is provided with an extension 13 also of magnetizable material on which is adjustably mounted by means of a screw or screws lat a smoothing plate 15 the surfaceof which is approximately perpendicular to that part of the surface of the table t on which the mandrel 5 is supported. Between said parts an air gap 16 is formed which is bridged by the mandrel 5 resting in the position shown. The adjustable mounting" of the plate 15 enables mandrels-of different diameter to be accommodated in the same machine. The table 4 may be of magnetic material or not as desired, but the upper part of the plate 10 or a strip 17 forming the upper part thereof also of magnetic material is brought into close proximity to the mandrel 5.

It will be observed that the plate 15 and the strip 17 or upper part of the plate 10 form the poles of the electromagnet.

The table may be provided with suitable heating elements indicated at 18, if desired, for the purpose of meltin the adhesive with which one side of the flexible material 3 may be coated. The electromagnet coil 12 is indicated as being supplied with current by mains 19 from any suitable source, with a variable resistance 20, inserted for adjusting the current if desired.

In operation, in the particular arrangement shown, the bolt 6 is rotated by means of the flexible driving connection 8 and the Cir flexible material 3 is wrapped therearound. Owing to the magnetic attraction between the bolt andthe .magnetizable plates 15 and 17, a considerable pressure will be exerted between these parts with the result that the flexible material is firmly and closely applied to the bolt without any necessity for supporting the bolt in bearings or applying mechanical pressure through external means. i The smoothing pressure may be varied if desired to suit the particular requirements by varying the excitation of the electro=magnetp Although one construction form of the invention has been described by way of illustration or example, this is only to be [regarded as typical as other forms may readily be devised and the construction varied very considerably in detail Without transgressing. the limits of the invention.

I claim as my invention 1- 1.A machine for wrapping bodies with flexible material comprising one or more smoothing members, magnetic means for holdinga body tobe wrapped against said smoothing members and means for rotatably supporting-said body.

2. A machine for wrapping bodieswith flexible material comprising a pair of magnetic poles for engaging a body to be wrapped, means for rotatably mounting said body and means for energizing said poles.

3. A machine for wrapping bodies with flexible'material comprising a base, a pair of magnetic poles associated therewith for engaging albody to be wrapped, means "for rotatably mounting said body, means for energizing the poles and means for heating the wrapping material.

4. A machine for wrapping. bodies with flexible material. comprising a base, a pair of magnetic poles associated therewith, a solenoid connectedto said p0les, thebody to be wrapped being disposed between the-poles,

means for rotating said body and means associated with said base for heating the wrapping material.

5. A machine for wrapping bodies with flexible material comprising a base having a pair of magnetizable plates arranged to provide an air gap, means for rotatably mounting a body to be wrapped between said plates in engagement therewith and means for magnetizing said plates.

6. A machine for wrapping bodies with flexible material comprising a base having a pair of plates arranged to provide an air gap, means for rotatablymounting a body to be wrapped between said plates in engagement therewith and means for magnetizing one of said plates.

7. A machine for wrapping bodies with flexiblematerial comprising a base having a pair of relatively movable plates arranged to provide an air gap, means for. rotatably mounting a body to be wrapped between said plates in engagement therewith and means for magnetizing one of said plates.

8. A machine for wrapping bodies with flexible material comprising a base having a pair of plates, one of which is adjustable relatively to the other to rovide an air gap, means for rotatably mounting a body to be wrapped between said plates in engagement therewith and means for magnetizing said plates.

9. A machine for wrapping bodies with flexible material comprising a base having a pair of plates, one of which is adjustable relatively to the other to provide an air gap, means for rotatably mounting a body to be wrapped between said plates in engagement therewith, means for magnetizing said plates and means for heating at least one of said plates. 7 y

In testimony whereof, I have hereunto subscribed my name this sixth day of November, 1923.

ALLAN MONKHOUSE. 

